commit 07c6d289e20a3bf0d83a689c96b11f34cd6e9466
author David Tolnay <dtolnay@gmail.com> Sun Aug 11 21:30:18 2019 -0700
committer David Tolnay <dtolnay@gmail.com> Sun Aug 11 21:30:20 2019 -0700
tree 9b50ead25c844c1b442e5edb0aa0e1dd95fe0adc
parent 406e22d320d5e045ec8fd7082276c7db227506d6

Remove description of old version support

We only support rustc versions that have the full proc-macro API these
days.

README.md

diff --git a/README.md b/README.md
index b21d4d0..3632fb9 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@
 [![Rust Documentation](https://img.shields.io/badge/api-rustdoc-blue.svg)](https://docs.rs/proc-macro2)
 
 A wrapper around the procedural macro API of the compiler's `proc_macro` crate.
-This library serves three purposes:
+This library serves two purposes:
 
 - **Bring proc-macro-like functionality to other contexts like build.rs and
   main.rs.** Types from `proc_macro` are entirely specific to procedural macros
@@ -21,13 +21,6 @@
   unit test. In order for helper libraries or components of a macro to be
   testable in isolation, they must be implemented using `proc_macro2`.
 
-- **Provide the latest and greatest APIs across all compiler versions.**
-  Procedural macros were first introduced to Rust in 1.15.0 with an extremely
-  minimal interface. Since then, many improvements have landed to make macros
-  more flexible and easier to write. This library tracks the procedural macro
-  API of the most recent stable compiler but employs a polyfill to provide that
-  API consistently across any compiler since 1.15.0.
-
 [syn]: https://github.com/dtolnay/syn
 [quote]: https://github.com/dtolnay/quote
 

src/lib.rs

diff --git a/src/lib.rs b/src/lib.rs
index 222edb5..6c896e0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,5 @@
 //! A wrapper around the procedural macro API of the compiler's [`proc_macro`]
-//! crate. This library serves three purposes:
+//! crate. This library serves two purposes:
 //!
 //! [`proc_macro`]: https://doc.rust-lang.org/proc_macro/
 //!
@@ -18,14 +18,6 @@
 //!   a macro to be testable in isolation, they must be implemented using
 //!   `proc_macro2`.
 //!
-//! - **Provide the latest and greatest APIs across all compiler versions.**
-//!   Procedural macros were first introduced to Rust in 1.15.0 with an
-//!   extremely minimal interface. Since then, many improvements have landed to
-//!   make macros more flexible and easier to write. This library tracks the
-//!   procedural macro API of the most recent stable compiler but employs a
-//!   polyfill to provide that API consistently across any compiler since
-//!   1.15.0.
-//!
 //! [syn]: https://github.com/dtolnay/syn
 //! [quote]: https://github.com/dtolnay/quote
 //!